indefatigable

An adjective is a word that describes a noun (e.g., the big dog).
adjective
1.
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(general)
a. infatigable
The army's indefatigable commander raised his sword and charged forward.El infatigable comandante del ejército alzó sus espada y salió a la carga.
b. incansable
The company's CEO works tirelessly. He seems indefatigable.El director ejecutivo de la empresa trabaja sin parar. Parece incansable.
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